Unity Issue Tracker - [OpenGLES3] GLSL Shader always renders in (0, 0, 0) position when built and deployed

Won't Fix

Votes

3

Found in

2020.3.44f1

2021.3.17f1

2022.2.2f1

2023.1.0b2

2023.2.0a1

Issue ID

UUM-3250

Regression

No

[OpenGLES3] GLSL Shader always renders in (0, 0, 0) position when built and deployed

Jun 03, 2022

Reproduction steps:
1. Open project "GLSL_URP.zip"
2. Open Scene "SampleScene"
3. Move the cube away from (0, 0, 0), for example, to (1, 0, 1) using the Inspector
4. Build and run

Expected result: The red cube is placed wherever the user placed it in the 3rd reproduction step
Actual result: The cube is placed in (0, 0, 0) position

Reproducible with: 7.5.2 (2019.4.18f1), 9.0.0-preview.72 (2020.1.17f1), 10.2.2 (2020.2.2f1, 2021.1.0b1)
Can't test with: 2018.4.30f1 (does not support Universal RP package)

Reproducible with:
Player on Windows 10
VLNQA00277, Asus ROG Phone, Android: 8.1.0, CPU: Snapdragon 845 SDM845, GPU: Adreno (TM) 630
VLNQA00006, Samsung Galaxy S7, Android: 8.0.0, CPU: Exynos 8 Octa 8890, GPU: Mali-T880
VLNQA00121, Samsung Galaxy S9, Android: 9, CPU: Exynos 9 Series 9810, GPU: Mali-G72

Not reproducible with:
Editor on Windows 10
Editor and Player on iMac 10.15.7, 3,4 GHz Quad-Core Intel Core i5 (OpenGLCore)
VLNQA00030, Lge LG G2, Android: 4.4.2, CPU: Snapdragon 800 MSM8974, GPU: Adreno (TM) 330
VLNQA00310 iPad Pro 12.9 1st gen (iOS 13.4.1)

Notes:
- After deleting Universal RP package, the issue does not reproduce
- Reproduces only on OpenGLES3 when running on Android

Resolution Note:

There are no fixes planned for this Bug

Comments (1)

N7RX_Y

Jan 24, 2023 21:20

This is not a bug but a compatibility issue between GLSL shader and SRP Batcher.

By default, URP enables SRP batcher (https://docs.unity3d.com/Manual/SRPBatcher.html), and it requires that all built-in engine properties to be declared in a single cbuffer. The GLSL vertex shader in the project uses gl_ModelViewProjectionMatrix * gl_Vertex, which internally generates a property matrix unity_ObjectToWorld that exists outside of the default cbuffer. Therefore, the matrix did not get updated properly when SRP batcher is enabled.

There are two solutions to this issue:
1. Use ShaderLab or ShaderGraph shaders instead of GLSL shader (recommended if possible).
2. Disable "SRP Batcher" in the project's Universal Render Pipeline Asset settings.

Please refer to https://github.com/Unity-Technologies/Graphics/blob/master/Packages/com.unity.render-pipelines.universal/Documentation~/shaders-in-universalrp.md#srp-batcher-compatibility for more info.

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